I'm probably missing something here - but Constant Contact (who we block by IP) have been a nagging source of spam for us. I'm just wondering why 25_uribl.cf has this line in it:
## DOMAINS TO SKIP (KNOWN GOOD) # Don't bother looking for example domains as per RFC 2606. uridnsbl_skip_domain example.com example.net example.org ...... uridnsbl_skip_domain constantcontact.com corporate-ir.net cox.net cs.com Is this a uri that is really suitable for white listing ?